Cosmic-ray proton and helium spectra: Results from the JACEE experiment

Citation
K. Asakimori et al., Cosmic-ray proton and helium spectra: Results from the JACEE experiment, ASTROPHYS J, 502(1), 1998, pp. 278-283
Citations number
49
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Space Sciences
Journal title
ASTROPHYSICAL JOURNAL
ISSN journal
0004-637X → ACNP
Volume
502
Issue
1
Year of publication
1998
Part
1
Pages
278 - 283
Database
ISI
SICI code
0004-637X(19980720)502:1<278:CPAHSR>2.0.ZU;2-U
Abstract
Measurements of the cosmic-ray hydrogen and helium spectra at energies from 20 to 800 TeV are presented. The experiments were performed on a series of twelve balloon flights, including several long duration Australia to South America and Antarctic circumpolar flights. No clear evidence is seen for a spectral break. Both the hydrogen and the helium spectra are consistent wi th power laws over the entire energy range, with integral spectral indices 1.80 +/- 0.04 and 1.68(-0.06)(+0.04) for the protons and helium, respective ly. The results are fully consistent with expectations based on supernova s hock acceleration coupled with a "leaky box" model of propagation through t he Galaxy.